Renesas 8312AYLF Clock Fanout Buffer - Equivalent & Substitute Parts

Part Overview

The Renesas 8312AYLF is a Clock Fanout Buffer (Distribution) IC with 1:12 output ratio operating at frequencies up to 250 MHz. This device features LVCMOS and LVTTL input/output compatibility with a 32-LQFP surface mount package. The part is classified as obsolete, making identification of active equivalent alternatives essential for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	8312AYLF
Manufacturer	Renesas Electronics Corporation
Product Category	Clock/Timing - Fanout Buffer (Distribution)
Type	Fanout Buffer (Distribution)
Number of Circuits	1
Ratio - Input:Output	1:12
Frequency - Max	250 MHz
Input Logic	LVCMOS, LVTTL
Output Logic	LVCMOS, LVTTL
Voltage - Supply	1.6V ~ 3.465V
Operating Temperature	0°C ~ 85°C
Package / Case	32-LQFP (7x7)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the Renesas 8312AYLF is determined by strict equivalence across the following critical parameters:

Fanout Ratio: 1:12 output configuration
Maximum Frequency: 250 MHz operation
Package Type: 32-LQFP (7x7) surface mount
Input/Output Logic Levels: LVCMOS and LVTTL compatibility
Supply Voltage Range: 1.6V ~ 3.465V
Number of Circuits: Single circuit configuration

The onsemi NB3V8312CFAG and NB3V8312CFAR2G meet all critical electrical and mechanical parameters required for direct substitution. Both parts maintain identical fanout ratio, frequency rating, package footprint, and logic level specifications. The primary differences between substitutes relate to product status (both active), packaging format, and operating temperature range extensions.

Parameter Comparison

Parameter	Renesas 8312AYLF	onsemi NB3V8312CFAG	onsemi NB3V8312CFAR2G
Manufacturer	Renesas Electronics	onsemi	onsemi
Product Status	Obsolete	Active	Active
Type	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)
Ratio - Input:Output	1:12	1:12	1:12
Frequency - Max	250 MHz	250 MHz	250 MHz
Input Logic	LVCMOS, LVTTL	LVCMOS, LVTTL	LVCMOS, LVTTL
Output Logic	LVCMOS, LVTTL	LVCMOS	LVCMOS
Voltage - Supply	1.6V ~ 3.465V	1.6V ~ 3.465V	1.6V ~ 3.465V
Operating Temperature	0°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	32-LQFP (7x7)	32-LQFP (7x7)	32-LQFP (7x7)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	2 (1 Year)	2 (1 Year)
Packaging Format	Not specified	Tray	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Both onsemi substitutes (NB3V8312CFAG and NB3V8312CFAR2G) are qualified replacements for the obsolete Renesas 8312AYLF. Selection between the two onsemi options depends on procurement and assembly requirements:

NB3V8312CFAG is supplied in Tray packaging and is suitable for applications requiring standard production quantities with standard handling procedures.

NB3V8312CFAR2G is the manufacturer-recommended substitute, supplied in Cut Tape (CT) and Digi-Reel® format with significantly higher inventory availability (33,300 pcs vs. 2,120 pcs). This option provides extended operating temperature range (-40°C to 85°C vs. 0°C to 85°C) and improved moisture sensitivity rating (MSL 2 vs. MSL 3), offering superior reliability margins for demanding applications.

Both substitutes maintain ROHS3 compliance and identical electrical specifications across supply voltage, frequency rating, and logic level parameters. The extended temperature range and improved MSL rating of NB3V8312CFAR2G provide additional design margin without functional compromise.

Frequently Asked Questions (FAQ)

Q: Can NB3V8312CFAG and NB3V8312CFAR2G be used interchangeably with the Renesas 8312AYLF?

A: Yes. Both onsemi parts maintain identical electrical specifications and 32-LQFP package footprint. The primary differences are packaging format (Tray vs. Cut Tape/Digi-Reel) and operating temperature range. Both are direct functional equivalents.

Q: What is the difference between the two onsemi substitutes?

A: NB3V8312CFAG is supplied in Tray format with standard inventory levels. NB3V8312CFAR2G is the manufacturer-recommended option, supplied in Cut Tape and Digi-Reel format with higher availability. NB3V8312CFAR2G also features extended operating temperature (-40°C to 85°C) and improved MSL rating (2 vs. 3).

Q: Are there any output logic differences between the Renesas part and onsemi substitutes?

A: The Renesas 8312AYLF specifies LVCMOS and LVTTL output logic. Both onsemi substitutes specify LVCMOS output only. For applications requiring LVTTL output compatibility, verification against specific circuit requirements is necessary.

Q: Do the onsemi substitutes maintain the same 32-LQFP package dimensions?

A: Yes. All three parts use identical 32-LQFP (7x7) surface mount packaging with matching footprint and pinout. PCB layout modifications are not required for substitution.

Q: What is the significance of the MSL rating difference?

A: The Renesas part carries MSL 3 (168 hours), while onsemi substitutes carry MSL 2 (1 year). MSL 2 provides extended shelf life and greater tolerance to moisture exposure during storage and assembly, reducing risk of moisture-induced failures in high-humidity environments.

Q: Are both onsemi parts ROHS3 compliant?

A: Yes. Both NB3V8312CFAG and NB3V8312CFAR2G are ROHS3 compliant, matching the compliance status of the Renesas 8312AYLF.

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